Napkins.. . For people to wipe their mouth and hands with? No. Don't
Cool art project?
I guess if I would try it, the uv flatbed. But not for food related napkins. Echo solvent would just bleed.
Latex? I've never worked with a latex printer.
Oh just thought of food printers... It's a thing. Not sure what they use. Doesn't seem very cost effective though. It's more novelty.